Commit ed51bba1 authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: cmac - Add support for cloning 



Allow cmac to be cloned.  The underlying cipher needs to support
cloning by not having a cra_init function (all implementations of
aes that do not require a fallback can be cloned).

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 51d8d6d0

crypto/cmac.c

+17 −1
Original line number Diff line number Diff line
@@ -213,7 +213,22 @@ static int cmac_init_tfm(struct crypto_shash *tfm) 
	ctx->child = cipher;



	return 0;

};

}



static int cmac_clone_tfm(struct crypto_shash *tfm, struct crypto_shash *otfm)

{

	struct cmac_tfm_ctx *octx = crypto_shash_ctx(otfm);

	struct cmac_tfm_ctx *ctx = crypto_shash_ctx(tfm);

	struct crypto_cipher *cipher;



	cipher = crypto_clone_cipher(octx->child);

	if (IS_ERR(cipher))

		return PTR_ERR(cipher);



	ctx->child = cipher;



	return 0;

}



static void cmac_exit_tfm(struct crypto_shash *tfm)

{
@@ -280,6 +295,7 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) 
	inst->alg.final = crypto_cmac_digest_final;

	inst->alg.setkey = crypto_cmac_digest_setkey;

	inst->alg.init_tfm = cmac_init_tfm;

	inst->alg.clone_tfm = cmac_clone_tfm;

	inst->alg.exit_tfm = cmac_exit_tfm;



	inst->free = shash_free_singlespawn_instance;